Flutter Impeller
impeller::FillRectGeometry Class Referencefinal

#include <rect_geometry.h>

Inheritance diagram for impeller::FillRectGeometry:
impeller::Geometry

Public Member Functions

 FillRectGeometry (Rect rect)
 
 ~FillRectGeometry () override
 
bool CoversArea (const Matrix &transform, const Rect &rect) const override
 Determines if this geometry, transformed by the given transform, will completely cover all surface area of the given rect. More...
 
bool IsAxisAlignedRect () const override
 
GeometryResult GetPositionBuffer (const ContentContext &renderer, const Entity &entity, RenderPass &pass) const override
 
std::optional< RectGetCoverage (const Matrix &transform) const override
 
- Public Member Functions inherited from impeller::Geometry
virtual ~Geometry ()
 
virtual GeometryResult::Mode GetResultMode () const
 
virtual bool CanApplyMaskFilter () const
 
virtual Scalar ComputeAlphaCoverage (const Matrix &transform) const
 

Additional Inherited Members

- Static Public Member Functions inherited from impeller::Geometry
static std::unique_ptr< GeometryMakeFillPath (const flutter::DlPath &path, std::optional< Rect > inner_rect=std::nullopt)
 
static std::unique_ptr< GeometryMakeStrokePath (const flutter::DlPath &path, const StrokeParameters &stroke={})
 
static std::unique_ptr< GeometryMakeCover ()
 
static std::unique_ptr< GeometryMakeRect (const Rect &rect)
 
static std::unique_ptr< GeometryMakeOval (const Rect &rect)
 
static std::unique_ptr< GeometryMakeLine (const Point &p0, const Point &p1, const StrokeParameters &stroke)
 
static std::unique_ptr< GeometryMakeCircle (const Point &center, Scalar radius)
 
static std::unique_ptr< GeometryMakeStrokedCircle (const Point &center, Scalar radius, Scalar stroke_width)
 
static std::unique_ptr< GeometryMakeFilledArc (const Rect &oval_bounds, Degrees start, Degrees sweep, bool include_center)
 
static std::unique_ptr< GeometryMakeStrokedArc (const Rect &oval_bounds, Degrees start, Degrees sweep, const StrokeParameters &stroke)
 
static std::unique_ptr< GeometryMakeRoundRect (const Rect &rect, const Size &radii)
 
static std::unique_ptr< GeometryMakeRoundSuperellipse (const Rect &rect, Scalar corner_radius)
 
static Scalar ComputeStrokeAlphaCoverage (const Matrix &entity, Scalar stroke_width)
 Compute an alpha value to simulate lower coverage of fractional pixel strokes. More...
 
static GeometryResult ComputePositionGeometry (const ContentContext &renderer, const Tessellator::VertexGenerator &generator, const Entity &entity, RenderPass &pass)
 

Detailed Description

Definition at line 13 of file rect_geometry.h.

Constructor & Destructor Documentation

◆ FillRectGeometry()

impeller::FillRectGeometry::FillRectGeometry ( Rect  rect)
explicit

Definition at line 9 of file rect_geometry.cc.

9 : rect_(rect) {}

◆ ~FillRectGeometry()

impeller::FillRectGeometry::~FillRectGeometry ( )
overridedefault

Member Function Documentation

◆ CoversArea()

bool impeller::FillRectGeometry::CoversArea ( const Matrix transform,
const Rect rect 
) const
overridevirtual

Determines if this geometry, transformed by the given transform, will completely cover all surface area of the given rect.

This is a conservative estimate useful for certain optimizations.

Returns
true if the transformed geometry is guaranteed to cover the given rect. May return false in many undetected cases where the transformed geometry does in fact cover the rect.

Reimplemented from impeller::Geometry.

Definition at line 36 of file rect_geometry.cc.

37  {
38  if (!transform.IsTranslationScaleOnly()) {
39  return false;
40  }
41  Rect coverage = rect_.TransformBounds(transform);
42  return coverage.Contains(rect);
43 }
TRect< Scalar > Rect
Definition: rect.h:792
constexpr TRect TransformBounds(const Matrix &transform) const
Creates a new bounding box that contains this transformed rectangle.
Definition: rect.h:476
constexpr bool Contains(const TPoint< Type > &p) const
Returns true iff the provided point |p| is inside the half-open interior of this rectangle.
Definition: rect.h:235

References impeller::TRect< T >::Contains(), transform, and impeller::TRect< T >::TransformBounds().

◆ GetCoverage()

std::optional< Rect > impeller::FillRectGeometry::GetCoverage ( const Matrix transform) const
overridevirtual

Implements impeller::Geometry.

Definition at line 31 of file rect_geometry.cc.

32  {
33  return rect_.TransformBounds(transform);
34 }

References transform, and impeller::TRect< T >::TransformBounds().

◆ GetPositionBuffer()

GeometryResult impeller::FillRectGeometry::GetPositionBuffer ( const ContentContext renderer,
const Entity entity,
RenderPass pass 
) const
overridevirtual

Implements impeller::Geometry.

Definition at line 13 of file rect_geometry.cc.

16  {
17  auto& host_buffer = renderer.GetTransientsBuffer();
18  return GeometryResult{
20  .vertex_buffer =
21  {
22  .vertex_buffer = host_buffer.Emplace(
23  rect_.GetPoints().data(), 8 * sizeof(float), alignof(float)),
24  .vertex_count = 4,
25  .index_type = IndexType::kNone,
26  },
27  .transform = entity.GetShaderTransform(pass),
28  };
29 }
@ kNone
Does not use the index buffer.
constexpr std::array< TPoint< T >, 4 > GetPoints() const
Get the points that represent the 4 corners of this rectangle in a Z order that is compatible with tr...
Definition: rect.h:418

References impeller::TRect< T >::GetPoints(), impeller::Entity::GetShaderTransform(), impeller::ContentContext::GetTransientsBuffer(), impeller::kNone, impeller::kTriangleStrip, and impeller::GeometryResult::type.

◆ IsAxisAlignedRect()

bool impeller::FillRectGeometry::IsAxisAlignedRect ( ) const
overridevirtual

Reimplemented from impeller::Geometry.

Definition at line 45 of file rect_geometry.cc.

45  {
46  return true;
47 }

The documentation for this class was generated from the following files: